Slim Iron Rods in Tension Contrast with Heavy Compression Timber Elements
by Peter Kneen
Title
Slim Iron Rods in Tension Contrast with Heavy Compression Timber Elements
Artist
Peter Kneen
Medium
Photograph - Photographic Print
Description
The heritage listed timber truss railway bridge comprises 77 timber trusses based on the American Howe truss concept. Each truss is approximately 35-40 feet long and the single rail track is on top of the bridge. These trusses are supported well above the flood plain of the Murrumbidgee River on tall timber trestles.
Locally sourced materials were the preferred choice in the era when the railways expanded rapidly in Australia. Australian eucalypt trees, and in particular the “Ironbark” variety possess great strength and stiffness. Solid timber members are used in the trusses and trestle supports to carry compression loads and in the deck where bending resistance is required. Iron rods are used to carry tension forces. Careful checking of the timber components means that most of the forces are transferred by direct contact.
Uploaded
January 12th, 2015
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